Improvement in sheaves for sliding doors



Patented Jan. 11, 187R C. H. WHITE.

SHEAVES FOR SLIDING-DOOR.

PETERS, PHDTOLITHUGRAFHER, WASHING'HIN. L C.

UNITED STATES P TENT OFFIoE.

CHARLES HARooUer warm, or NEW YORK, N. Y.

IMPROVEMENT IN SHEAVES FOR suome ooons.

Specification forming part of Letters Patent No. 172,226, dated J anuary 11, 1876, application filed 1 December 7, 1875.

To all whom it may concern:

Be it known that I, GHAnLEs HARooURT;

WHITE, of New York, in the county and State.

of New York, have invented certain Improve-l ments in Sheaves for Gar-Doors and other; Sliding Doors; and I do herebydeclare thatthe following is a full, clear, and exact descrip-' .tion of the same.

" works. The sheave-pintle is usually made in one piece with one of these plates, and the chafing or lateral wear and friction of the sheave are against the inner sides of the plates, so that when they become worn to a certain extent it is necessary to entirely replace'them by new ones.

The object of my invention is to render the sheaves and their pintles and carrying-plates more durable than those heretofore in use, and to lessen the expense consequent on the re-. newal thereof when worn, and the expenditure of time and labor necessary in order to effect such renewal.

To this end the invention consists in a novel construction of the carrying-plates, and the combination therewith of removable chafeplates and a removable shield for the sheavepintle, whereby provision is made for the ready and economical renewal of only the parts subject to wear and friction, without the necessity for renewing the plates themselves, or for removing more than one of them in order to effect the desired renewal.

In carrying out my invention I make the carrying-plates similar in their general form and construction to those in common use, with the sheave-pintle in one piece with one of said plates, and its end entering a seat or bearing in the other plate when the parts are in place. Surrounding the pintle on one plate and the bearing for its reception on the other, I form a circular or polygonalbossor rib, the space within the boundary of which serves as a seat for-a removable chafe-plate. The sheave'pintle is made smaller than the opening in the sheave for its reception, and is re-enforced by a tubular shield surrounding it, and receiving the wear and friction of the sheave. This shield has its ends squared and engaging with sockets in the chafe-plates, to prevent it from turn- -ing when in place. The-shield and chafeplates and the sheave itself are made of chilled iron, and are, therefore, harder and more durable, and will stand more wear and friction, than it made of ordinary cast-iron.

When, however, the parts becomeloose fromlong wear, they maybe renewed by simply taking off one of the brass face or carrying plates, and substituting anew shield and chafe-plates for the old ones, and again replacing the face plate, which, with its fellow, not being subject to any wear whatever, will last much longer than those of the ordinary construction; I thus, in the first place, make the sheave and its connection much more durable than those which are in common use, and I also reduce the expense of renewal and the time and labor necessary therefor.

The accompanying drawing illustrates the manner of carrying out my invention.

Figure 1 represents a vertical section of my invention as applied to a car-door-a portion of the door itself and the rib or head on which the sheave runs being shown in dotted lines.

Fig. 2 is a view of the inner side of one of the carrying-plates. Fig. 3 is a detail view of one Fig. 4 is a side view ofof the chafe-plates. the re-enforcing-shield, and Fig. 5 is an end view of the same.

The sheave B is of the usual or any suitable form, and is made of chilled iron in order to increase its durability. The carryin g-plates (3 0 may be of brass or any other suitable metal. The

plate 0 has the sheave-pintle 01 cast or formed in one piece with it, and the plate 0 has an opening, d*, for the reception of the end of said pintle, and forming a firm bearing therefor when the two plates are in place with the sheave between them. In the usual construction of these carrying-plates the pintle is made of the same size as the hole for its reception in the sheave, and when the pintle hereinafter described. axis for the sheave-thus 'formed by the-sleeve becomes so much worn as to be useless the entire plate is thrown away.

In my invention, in order to provide for compensating for the wear of the pintle, I make it considerably smaller than the hole in the sheave, and surround it by a re-enforcing shield or sleeve, E, of tubular form, the external diameter of which corresponds with the diameter of the hole in the sheave, so as to fit nicely therein. This shield or sleeve E thus becomes the bearing on which the sheave revolves; and in order to prevent it from: turn-- ing when in use its ends are squared. and enter recesses of corresponding form in the stationary carrying-plates, or in chafe-plates, When the hearing or becomes s0-=worn as to require-renewal,itmay bereadily-removed and replaced by anew one. As the friction of the sheave predomimates in one direction the wear-upon the sleeve 'is on :one sideonly, so thatw-hen that one,

side becomes-so worn as to require renewal it may be rcversed,-so as toL-brin g the wear on: the opposite side, and thus'the axis of the sheave may be made to .wear much longer than one which is not reversible. i

.In' the usual construction of the carryingplatesth-e -wear and. friction of the sheave in .a lateral direction, or parallel with its axis, are against the inner sides of the two plates, and when they becomeworn both plates are thrown -aside-as useless. This .isalso avoided. in my invention by the peculiar construction of the plates and the use of renewable chafe-plates.

On the inner side of each of the plates G and Cflsurrounding the pintled or theopeni-ng d 1 form a-boss, rib, or bead, f,-the outline of which is preferably polygonal, as shown. The spacewithin thecircumference of this boss,

Irib, or bead' formsa "recess or'seatfor holding a removable chat'eplate. H, of corresponding outline. (See Fig. 3.) This chafeplate is provided with a square central opening, for engagement with the squared ends of the sleeve 'E, before described. When the chafe-plates are in place in their seats, with the various parts in operation, they receive the lateral wear and friction of the sheave, and when they become worn they are readily replaced by new ones. If the wear is only partial they may simply have their position changed or reversed.

By the construction and arrangement herein: described the parts subject to wear are renplates, remove the worn parts, and substitute new ones, or change the positions of the old ones, and then return the plate to its place.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with a sheave and removable chafe-plate, of the carrying-plate, provided with a boss, rib, or head, forming a recess or seat for the chafe-plate, substantially as herein described.

2. The combination of the plates O G ,constructed as described, with the sheave B, shield or sleeve E, and chafe-plates H H, arranged and operating substantially as and for the purposes specified.

CHARLES HARGOURT WHITE.

Witnesses:

BENJAMIN W.-HOFFMAN, v FRED. HAYNES. 

